Dressing form for underreamer lugs



Sept. 1931. c. H. BROWN 1,823,782

DRESSING FORM FOR UNDERREAMER LUGS Original Filed May 28 1926 INVENTOR 61H Brown Win/ A96 ATTORNEY Patented Sept. 15, 1931 I warren stares: ear aiar orerca CHARLES HENRY BROWN, OF BRECKENRIDGE, TEXAS DRESSING FORM FOR UNDERR-EAMER-LUGS Original application filed May 28, 1926, Serial N 0. 112;350. Divided and'this application filed September- 22,

1927. Serial No. 221,333; 7

This invention relates to an improvement theicutter, and a: surface 4 to support the in dressing forms for underreamer lugs and body thereof, a steel die 5 being provided constitutes a division of my application Seagainst which the cutting portionof the blade rial Number 112,350, filed May 28, 1926, for may bare-formed. Thisdie 5 is preferably an underreamer patented February 14, 1928, cast integral with the chilled surfaces and: No. 1,659,514. ground. The object of the invention is to provide The base 1 of the'dressingform hasacya device of this character which is particlindricalportion 6, the lower part of'which ularly adapted for underreainers with bodies presents the surface 3 andthis cylindrical in which the lugs fit in such a manner that portion carries a clamping screw 7 which is the shanks are so held in the body that the cn'gageable with theshank of the blade: to cutting portion of the lug or cutter can be clamp: the same firmly in position on the dressed to correct gauge by re-forming it dressing form. against the die portion of the dressing form; If the shoulder 11 of the-bladehas become 15 the dressing form having surfaces for the worn', a-number of shims'S maybe interposed shanks of the lugs to fit in or against corbetween the shoulder of the blade andthe responding dimensions to the portion of the: shoulder SprOvidedOn-the base-1 of-thedressbody holding the cutter while it is in a cut:-- ing: form between the'surfacesdand 4:. I ting position. When t-hereamer blade B has been clamped 2 Another object of the invention is to so con on: the base of: the dressing form shownby struct a. form of this character whereby the screw 7-, its cutting port-ion: overlies the means are provided for insuring all the cut die 5,and the metal'making up the cutting ters of the set being dressed to the same portionrmay be forced up against the die to length, therefore avoiding breakage of oints, renew and re-form-the cutting edge. 1 In Fig. ruining of bodies, or losing of lugs, or entire 2; a fullenF is shown-placed against the cut-- uuderrea ners due to only one lug taking thetingp rtion, and when this fuller isstrucl' blow in each stroke of the tools. With a sledge hammer, the cutting portion In carrying out these objects, the inventio will. be displaced. aga the die and I is susceptible of a wide range of modification f ImQd on its outside and the cutting face i": without departing from the spirit or sacriformed-"flush: witlr the'die un' e p rfectly ficing any of the advantages of the claimed true and with all the cutters of one set dressed invention; there being Shown in the drawings With the same shims behind the shoulder all for illustrative purposes a preferred and W111 be ex ctly the Same length. Of course, practical form, in which; the cutter or blade is heated before being Figure 1 represents a front elevation of a Placed 1n the dressing l dressing form constructed in accordance with I11 h f rm shown in Fig. 3 the die 5 is sethis invention; cured to the base 1 by means of screws 8a and Fig. 2 is a central longitudinal vertical sech 11 rests on an underlying supporting tion thereof showing how the blades are posirib 9- tioned and operated upon the dressing form; It will thus be seen that by the use of a and dressing form constructed as herein shown Fig. 3 is a similar View showing a slightly and described that the shanks of the lugs different manner of mounting the die on the are SO held in the body that the cutting porbody of the form. tion of the lug or cutter can be dressed to f In the embodiment illustrated a dressing correct gauge by re-forming it against the 7 form is shown comprising a base 1 which may die portion of the dressing form, which dressbe suitably supported as indicated at 2 the ing form has surfaces for the shanks ofthe bottom of which is inclined so as to set on lugs to fit in or against them corresponding to a slant to facilitate dressing the lugs and the dimensions of the portion of the body 50 which has a surface 3 to support the shank of holding the cutter while it is in a cutting posi 10o tion, the dressing form having clamping means to hold the cutter securely while it is being dressed. By using the shims S to compensate for wearrall of the cutters of a set may 5 be dressed to the eXact gauge and also to the same length. This dressing of the cutters to the same length prevents much breakage of joints, as well as the ruining of bodies and losing of lugs, which is often occasioned when one lug only takes the blow at each stroke of the tool.

1W ithout further description it is thought that the features and advantages of the invention will be readily apparent to those skilled in the art, and it will of course be un 'derstood that changes in the form, proportion and minor details of construction may is resorted to, without departing from the spirit of the invention or its scope as claimed.

I I claim A dressing form for use in connection with reamer blades having shanks with rounded backs; said form including a base having surfaces cooperable with the cutter and shank V of the blade to be dressed and having a die against which the cutting edge of the blade may be re-formed, said base having a shoulder between the surfaces thereof which supports the cutter and shank of the blade, said 7 shoulder being designed to coact with the shank of the blade of the body thereof, said blade having a shoulder at the junction of its shank and body, said base having its bottom inclined to position the form on a I slant to facilitate dressing of the lugs and shims interposable between said shoulder and the shoulder of the blade to cause the cutters to be positioned according to the wear of the material on the cutting edge thereof to insure all the cutters of a set being dressed to the same length to avoid breakage of joints, ruining of bodies, or losing of lugs, incident to one lug only taking the blow in each stroke of the tool.

f I CHARLES HENRY BROWN. 

